The document covers the characteristics and measurements of light, including luminous intensity and luminous flux. It explains how light intensity can be calculated based on power and area, alongside activities to reinforce understanding of light properties and the electromagnetic spectrum. Additionally, it addresses concepts such as shadow formation and the relationship between wavelength and frequency in the visible light spectrum.

1. Characteristics of
light
PREPARED BY: Jeymar Payumo

2. LEARNING OBJECTIVES
IDENTIFY THE CHARACTERISTICS OF LIGHT
CALCULATE THE INTENSITY OF LIGHT
INFER THAT BRIGHTNESS OF LIGHT IS DEPENDENT ON THE DISTANCE
OF THE SOURCE

3. El Gamma’s Touching Tribute to
Mother Nature

4. PRE-ACTIVITY
Complete the diagram by listing all electromagnetic wave in order
1
2
3 4 5 6 7

5. How do shadows formed?
The light rays were blocked by an object. The light
rays cannot pass through it, instead it creates an
outline of the object

6. Electromagnetic Spectrum
1 2 3 4 5 6 7

7. VISIBLE LIGHT

8. Have you ever
seen a rainbow?

10. VISIBLE LIGHT SPECTRUM

11. VISIBLE LIGHT SPECTRUM

12. PHOTOMETRY
Measurement of the brightness of a light source.
2 MEASUREMENT QUANTITIES OF LIGHT
LUMINUOS INTENSITY
-Measured of light source
- Measured in terms of
Candela(cd)
LUMINOUS FLUX
- Rate at which light is
emitted from the source
- Expressed in terms of
Lumens(l)

13. How to calculate
light intensity?

14. Intensity(I) = Power(P)/ Area(A)
Suppose a light source(bulb) has 300 Watts. What Is
the intensity of light if the distance from the light
source is 20 meters.
I=P/A

15. Suppose a light source(bulb) has 300 Watts. What Is
the intensity of light if the distance from the light
source is 20 meters.
I=P/A
P= 300 Watts; r= 20

16. Compute the intensity of the
following.
SEATWORK
SOURCE OF LIGHT DISTANCE FROM THE LIGHT
Incandescent bulb (100W) 1.5 m
Incandescent bulb (200W) 3 m

17. ACTIVITY
Read and analyze the following statements given. Tell whether the
statement is true or false.
______1. In the visible light spectrum, red has the longest wavelength.
______2. In the visible light spectrum, violet has the highest frequency.
______3. If a wave in a spectrum has the shortest wavelength, then it
has the lowest frequency
______4. The frequency of a wave is directly proportional to its
wavelength. false
______5. The energy of the wave does not depend on the wavelength
and frequency.